Bag-bottoming machine.



1G. B. STILWBLL.`

BAG BOTTMING MACHINE. APPLICATION FILED JAN,25, 1907.

1,058,806. PatentedApr.15,1913.

13 SHEETS-SHEET 1.

C. B. STILWELL. BAG BoTToMING MACHINE.

APPLIGATION FILED JAN. Z5, 1907.

31,058,806'. Patented Apr.15,1913.

13 SHEETS-SHEET 2.

I Armar/5r.

G. B. 4STILWELL.

BAG BOTTOMING MACHINE. APPLICATION FILED JAN.25, 1907.

Patented Apr. 15, 1913.

1.3 SHEETS-SHEET 3.

; A TTHNE G. B. STILWBLL.

BAG BoTToMING MACHINE.

APPLICATION IILIED JAN.25, 1907.

Patented Apr. 15, 1913.

13 SHEETS-SHEETL INVENTUM' 'Aza/ 3M A i c. B. STILWELL.

BAG BOTTOMING MACHINE.

APPLIUATION FILED :1.511.25, 1907.

Patented A111115, 1913.l

J Arron/JU.

0. B`. STILW'ELL.

BAG BOTTOMING MACHINE. APlrLIoATIoN FILED .1.111.25, 1907.

Patented Apr. 15, 1913.

13 SHEETS-SHEET 6.

Wl TNESSES NYEN T03.

di ATTORNEY.

C. B. STILWELL.v

BAG BOTTOMING MACHINE.

APPLIOATION FILED 11111.25, 1907.

1,058,806.: Patented Apr. 15, 1913.

13 SHEETS-SHEET 7.

C. B. STILWELL.

BAG BOTTOMING MACHINE.

APPLIUATION FILED JAN.25, 1907'. N 1,058,806. Patented Apr. 15,1913.

13 BHEETSSHEBT 8.

' faz fr ff;

C. B. STILWELL. BAG BOTTOMING MACHINE. APPLICATION FILED JAN.25,11907.

Patented Apr. 15,1913.

13 SHBETS-SHEBT s.

NNN

mmfssfs:

er Mad@ rra/mn QNN C. B. STILWELL.

BAG BoTToMING MACHINE.v

` APPLICATION :FILED JILZ, 1907.

Pantd Apr. 15, 1913.-

' 13 BHBETB-BHBBT 10.

fm. 2a,

4f.; Arronnr G. B. STI'LWELL. BAG BoTToMING MAGHINB. Y APPLICATION FILED JAH.25, 1907.

Patented Apr. 15, 1913.

I "I ulm lll! G. B. STILWELL. BAG BOTTOMING MAGHINE. PPLIoA'rIox FILED unas, 19o?.

Patented Apr.'15,1913.

`13 SHEETS-SHEET 12.

WIT/(3358 ATTUIMEY. v

C. B. STILWBLL. BAG BOTTOMING MACHINE.

APPLIoATxoN FILED JAN-.25. 1907,

Patented Apr. 15, 1913.

1a suns-SHEET 1a.

WTNESSES f f M g ETE SATES i CHARLES B. STILWELL, 0F WAYNE, PENNSYLVANIA, ASSIGNOR T0 UNION PAPER BAG MACHINE COMPANY,

PENNSYLVANIA. f f

0F PHILADELPHIA, PENNSYLVANIA, A CURPORATION- OF BAG-BOTTOMING MACHINE.

inasgsoe.

Specification of Letters )PatentV Patented Apr. 15, 1913.

`Applicationfiieaxmmryiea,1907. seriinesaoos. g

To all whom t may concern y Be it known that I, CHARLES B. STILWELL, a citizen of the United States ofv America, residing in lVay-ne,`in the county of Dela` ware and Starte of Pennsylvania, have in-1 finished square bottom bags by working on' the blanks in a manner in which strains tending todisrupt the paper or like material `are' avoided, and thereby forming the bags with a minimum of Waste.

ln the embodiment of my invention disclosed therein, onel end of each blank isl first diamond folded and then fiapfolded, while being supported by a rotary folding cylinder `or blank support, and the latter is provided with a plurality of blank supporting surfaces or folding beds, so that in normal operation a plurality of blanks are being transported by the folding cylinder, and are undergoing manipulation at any one instant. Some of the various v,instrumentalities operating on the blankare carried by the folding cylinder and` others are supported independently of the` cylinder.

The various novel constructions and combinations which characterize the means employed for transporting the blanks and diamond and iap folding them are pointed out with particularity in the claimsanneXed tof and forming a part of this specification. For a better. understanding of my invention, however, and the advantages possessed by it, reference may be had to the accompanying drawings in which I have illustrated one form in which it may be. carried out.

In the'drawings, Figure 1 is a sidey elevation of the machine. looking at the frontend ofthe folding cylinder. Fig. 2 is a plan view of the machine. Fig, 3, is` an elevation of the machine, taken at rightangles Ato 1. Fig. 4 is a View taken similarly to Fig. 1 with parts broken away, showing the pasting and flap'creasing devices. Fig. 5 is a plan view of thel mechanism shown in Fig. 4. Fig. 6 is a sectional elevation yon the linc 6--6 of Fig. 3. Fig. 7 is an enlarged View taken similarly to Fig. 1, showing ya portion of the foldingv cylinder and folding mechanism carried by it. Fig. 8 is a plan view Aof the mechanism shown in Fig. 7.

Fig. 9 is a sectional'view of a portion of tbe folding cylinder taken on the line 9-9 of Fig. 7. Fig. 10 is a View similar to Fig. 9, I

taken on the line 10-10 of Fig.. 7. Fig. 11 is a sectional View showing a Vportion of the folding cylinder and the flattening mechanism. and taken on the line 11---11 of Fig.' l. Fig. 12 is an end elevation of the Hattening mechanism. Fig. 13 is a rear view of the mechanismshown by Fig. 12. Fig. 14.- is an enlarged detached end view of a portion of the flattening mechanism, partlyv in section o-n the line lill-14 of Fig. 13. Fig. 15 vis a rear view of the mechanism shown by Figgllf. Fig. 1.6 is a sectional elevation on the line' 16-16 of Fig. 17, illustrating the movement of the flattening Wings yduring the flattening operation. I, Fig. 17 is a section on the line 17-17 of Fig. 16. Fig. 18 is a sectional view-on the line 18.-18 of Fig. 4:, illustrating the construction of the flap creasing mechanism. Fig. 19 is a sectional elevation of the Hap lifting roll taken on the l Fig. 24 is 4a sectional lelevationoin the yline 24-,24 of Fig.i25.j Fig. 25 is an end elevation. ofthe rear airbo'x shownin". Fig. 30. Fig. 26 isf an end elevation of the `suction roll for removing 4the bags Afrom the folding cylinder. Fig; 27 fis asfection on the line 27 -27 of Fig- 26. Fig. '28 'is asection on the line 28f28of Fig. 27, lookingin the direct-ion indicated bythe arrows. Fig. Q9 is al front lvievv of al portion of the folding cylinder and front air box. Fig. 30 is a section on the line 30-30 of Fig. 29, Fig. 31 is a rear view of a portion of the mechanism shown in front elevation in Fig. 29. Fig. 32 is a sectional elevation of the 'front air box of` Fig. 30, taken on the line 32-32 Aof Fig. 33. Fig. 33 is a sectional elevation taken on the line 33-,33 of Fig. 32. Fig. 34 is a front elevation of the mechanis for holding the overlapping tube seam edges against relative'movement during the folda sect-ion of a portion of the/air pipe and valve on the'line 4(1*40 of Fig. 36, showing the valve open. Fig. 41 is a similar A view, showing `the valve closed. Fig. 42

(on'same sheet wit-h Fig. 7) is a detached perspective of a portion of the mechanism `for folding the back flaps. Fig. 43 is a detached perspective of a portion of the mechanism for holding the front flaps inran elevated position. Fig. 44 is a perspective View showing relat-ive positions of a portion of the lfolding cylinder land 'bull-nose roll, shortly after the bull-nose has depresseda portion of a bag blank into the cylinder.

. Fig. 45 vis al erspective view illustrating the 1,49 .isla perspectwe vlew showmg the curved operation o .the flap lifting roll.4 Fig. 46 is -a viewY similar to Fig. 45showing the position ofthe'same parts at a slightly later stage. jiFig. 47 is a perspective view illustrating the 'beginning of the box forming operation. Fig. 48 1s a perspective view rshowing theposi'tion of the parts at the conclusion. of thebox opening'operation. v Fig.

` iiattenerlwings in position to begin the box iatteriing operation. Fig. 50 shows the same parts as Fig. `49 at'the conclusion of the flattening operation. Fig. 51 is a perspective y view illustratin .the operation of the pasting devices. Flgs. 52 and'A 53 are perspective views illustrating the operation of the Hap creasing devices. Fig. 54 is a'perspec` ti-vefview illustrating the operation ofthe back flap folding devices, and the front Hap lifting devices Fig. 55 is a perspective View illustrating the operation of the front ap foldin means. Fig. 56 (on same sheet as Fig. `7 is a perspective detached view illustrating the means for sliding one of the turning back wing slides in its curved guide. Flg. 57 (on same sheet with Figs. 4 and 5) is .a detached perspective View, showing a portion of the bottom creasing mechanism.

It should be Y remarked that in several views .parts have been omitted when their absence would not'be misleading in order to avoid unnecessary complexity.

In the drawings, A designates the main stationary framework of the machine by which are supported the shafts, brackets, etc. The vertical shaft B is the main driving shaft.` Through beveled gears .,Bl and B2, shaft B drives a horizontal shaft B. Shaft B3 through gears B4, B, B7, B", yB11, B13, BU, B1, B18 mounted on stud B1, B20, B22, B23 mounted on stud B24; B25 mounted onstud B2, B27, B2B, B3", B32, and B34 drlve the various horizontal shafts parallel to B3, designated b symbols B, Bf, B1", B12, B14, B17 B21, J4 ze B31, B35 and Bas The rotating blank support or folding cylinder C is carried by the shaft B on which it is secured.- The rim of the folding cylinder is connected to the webs C2 extendingradially froin the ends of hub C3 by arms C1. The folding cylinder is of the multiple folding bed type, that is, it is adapted to hold at one time a plurality (a half g5 dozen) of bag blanks which are in various stages in their progresstoward the completed form. The blanks are fed successively to the folding cylinder as the latter rotates by the feed rolls E and El- (see Fig. 6). The roll E2 adjacent the roll E1 is provided at one portion of its periphery with an axially extendin partially sunken, roller-like member or bullnose E3 which is shorter than the width of the blanks op- 95 erated upon as shown in Fig; 44, and depresses a portion of each blank into one of vthe axially extending recesses C5 formed in the periphery of the folding cylinder. There is one of these recesses Cl5 formed in thc folding cylinder for each of the plurality of folding beds and the forward edgeof each recess, having reference to the direction of rotation of the folding cylinder, is practically coincident .with and assists in determining the primary transverse cross fold line of the blank diamond folded on the folding bed to which the recess belongs. The blanks are retained in the recesses C5 partly by the tongues or fingers G25 and g25 which 110 are moved axially into the recesses from the front and back sides of the folding cylinder over the paper in a manner hereinafter described. The paper is also held in the recesses by air suction. For this purpose, ports or suction holes C are formed in the bottom of each recess C5. The suction holes for each recess C5 are connected through a corresponding air passage C7 in the folding cylinder and air pipe CB at the back of cylinder (right hand of Fig. 30 and Fig.31) to the proper one of a set of air passages Co in the web C2; each passag C is provided with a port C10 in the outer wall of the web. A

.stationary air box D (Figs. 24, 25, 30 and 125 31) supported on the shaft Bc and held against rotation by the stud d1 extending from the cam frame ga'bears against the outer face of the web C2 and is provided with an arc shaped slot or passage D1 which 130 50 The outer pcrtions o the guides C20 adjacent extends about the shaft B6 from a point adjacent the roll E2 where the blank is received by the folding cylinder to a'point adjacent the roll f where the blank, after being` folded, is removed from the folding cyliny ports C for each folding bed are normally connected to exhaust through port D1 except when moving from the blank discharging to the blank receiving positions. A cam lug g37 carried by the stationary cam frame g33 (Fig. '37) acting on the cam levers C14 in sures that each valve is always open as the corresponding folding bed moves into the blank receiving position. The cam lug g3" is so located that it will 'engage the lever C11 if the valve. controlled by it is closed just prior to the movement of the corresponding folding bed into the blank receiving 'positie-n. Each cam lever C14 is connected to, its valve C12 by the valve stem C13. Each lever C11 is pivoted onl studs C15, carried by la bracket g19 projecting fromthe corresponding bracket g secured to the rear end of the folding cylinder.

Means are provided for closing each valve C12 when its folding bed ymoves .through the blank receiving position without receiving a blank. These `means comprise a link C18 having a back turned end o16 movable through an opening in the bracketv y extending from the cam supporting spiderg1, into and out of position to 4engage the back side of the cam levers C11' and move them to close' their-valves C12. The lower end of the link C16 is connected` to a crank' arm C17 secured to the.crank shaft C18 see Fig. 6). The crank shaft C1B has secured to it. bosses C19 in which are held the r'eversely curved tell-tale guides C20 which extend between the rolls E E1 through rooves e in the roll E.

the folding cylinder normally serve to deflect the blank fed between the rolls E, and E1, into position to be gripped between the roll E1 and the .folding cylinder. In case a blank is not advanced by the rollsv E and E1 at the proper time, the guides C20 are moved by the weiglt of the arm C" and parts attachedk to it into the angular Igrooves e1 (see Fig. 38) formed to ,receive them in the periphery of the roll E1. The resultant movement of the arm C17 causes the link end c1 to be moved into position to engage the corresponding cam lever C andv close its valve C12. This prevents a leakage into the vtucked sides ofthe tubular blank air passage D1 :from the ports C? of an empty folding bed and interference with the suction in folding beds which may be supplied with blanks.

The valve C12, if closed', is thrown by the stationary lug g37 to the open position when next the folding bed approaches t-he blank receivilg position. An arm C21 projecting from the shaft C18 engages with a cam C22 on the shaft B10 which carries the roll E and insures that the `tell-taleguides C20 are held out of the grooves e1 at the inst-ant at which a blank should be passed between the rolls E and E1. The cam4 lug G37 comes into play only when -a valve C12 its closed, and valve C12 is closed only when the correspond ingfolding bed moves away from the blank receiving posit-ion without receiving a blank. Normally each valve C12 remains open continuously. The exhaust from the `suction ports C is cut ofi as the corresponding fold- 'ing beds move from the blank discharge to *the port D1 is arc shaped, extending about the shaft B through an *angle in the neighborhood of three hundred degrees. The provisions for cl-osin communication between-the exhaust ports 6 when these are j not covered by bag blanks, and the main exhanst pipe preventsthe fall of the vacuum in the' exhaust pipe, or the increase in the load on the motor maintaining the vacuum, which would otherwise occur from air passing into the pipe through the open ports C1.

In frontof the recess C5 of each folding bed are located a set of suction ports C21. Each setcommunicates 'through its passagel C21 in the folding cylinder and air pipe C15 with one of a set of air passages C1 in the front web C2. Leading from each air passage C16 is a port C11lwhich opens into the port-D10 of the air box D. The latter is supported by the shaft B against the front web C2 and held against rotation by the stationary stud d attached to the stationary cam frame G12. The port D10 is connected by the air passage D11, coupling D12 and flexible tube D13 tothe pipe D11 which in turnis connected by pipes D15 D1s D17 to the main exhaustfpipe D8, The port D10 is arranged relatively to the'suction holes C23 so that the suction holes C23 of each folding bed are connected to exhaust-to hold the lower ply of the ap end offthe blank against the cylinder while the corresponding upper ply portion' of the blank is being lifted by the roll F to permit the insertion in the wing folders Gr8 G13 g8 ga.

The roll VF (see Figs. 45 and `47.6) hasl the of the y same peripheral speed as the folding cylinder and is of a circumference double that of the peripheral di'stance between adjacent folding beds on the folding cylinder. It is provided with a pair of diametrically opposed sets of sucti-on openings F2, (see Figs. 21 to 27 inclusive) each set of ports being.

connected by a passage F3 with the proper one of a pair ofvports F5. The ports F5 are moved into communication at the proper time in the rotation of the roll F with the port D13 of the air box D1.8 which is supported on the shaft B3 against the front end of the ro-ll F and held against rotation by the pin D23 carried by the bracket D25 fastened to the framework A. The port D19 is connected by theair passage D2'0 and pipes D21 and D23 to the pipe D15 connected to the main exhaustpipe D3. The purpose of the roll F, as before stated, isto lift the upper ply of the flap end of the blank to permit the insertion of the wing'folders G8 G53 93 953 into the tucked sides of the blank.

As the wing folders are inserted, connection between the corresponding ports F2 and the exhaust pipe is broken by the movement of the port F5 out of register with the port D13.

- The operation of the roll F is illustrated by Figs. 4:5 and 46. v

It may be here remarked that the roll f which ,removesl the blanksfrom the folding cylinderand is carried by the shaft B31 is identical in construction with the roll F and is provided with ports, air box, etc. of the same character, the parts being designated by the letters l and f with fthe same exponents employed with letters D and F to designate similar parts. l

To insure that theblanks are held inplace against the folding cylinder while traveling from the ro-ll E2 to the roll F, guides E1 areprovided which are supported by the downwardly extending straps E5 fastened to the framework A. The 4guides E'1 are each inf the form of a crescent shaped plate, the; plane of which is-transverse to the axis ofl rotation of the folding cylinder C, and having its inner curved edge embracing the adjacent portionof the periphery ofthe fold- -ing cylinder C. The upper ends of these guides extend into grooves F1 formed yin the roll F and the lower ends of the guides into correspondingl grooves 613 formed in the4 manner through the instrumentality of'cam frames G22 and 933. The frame aG22 surrounds the shaft B3 at the front of the cyl- 'Io thev front endl of the 'cylinder are secured a set of brackets G one for each folding bed. A set of similar brackets 9 are secured to the back end of the cylinder.

There are a set of folding devices, which I may call wings, for each folding bed.

Each set includes a pair of wings G53 933 which I may call holding down wings and a pair of wings G3 93 which I may call turning back wings. The Wings G3 and G53 are at the front end 'of the cylinder and the wings 93 and 953 are at the back end ofthe cylinder. The folding wings for each folding bed at the fro-nt side of the folding cylinder C are supported by the corresponding bracketl G and the corresponding :folding wings on the opposite side ofthe folding bed are supported by the opposing bracket 9. Each of the two brackets G and 9 for each folding bed has bearings G1, 91' supporting hollow shafts G2 92, the common axis of which is approximately in alinement with the transverse cross fold line of the blank folded on the folding bed.

The holding down wings G53 953 are carried by curved-slides G52 952 which slide in curved guideways formed in guides G51 and 951. Similarly the turning back Wings G5 and 93 are carried by curved slides G7 and 97 whichl slide in curved guideways formed in the guides G13 93. The slides Gfand 91 are connected by studs G3 93 to extensions G13, 91o from disks G11 911. Similarly the slides G52 952 are connected by studs G51 934 to parts G55 955 extending from disks G5 95. The disks G53 and Gr.11 are slidingly supported by the hollow shaft G2 and are moved on the shaft, by means of plates G12 which are connected 'at their inner ends by spacing blocks G13. The l plates G12 are prevented from rotating on their shaft G2 by a positioning shaft or pin G24 secured to the plates and sliding intoand out of an aperture formed for the purpose in the corresponding arm C1. Similarly each pair of disks V911 and 953 are movedon their hollow shaft 92 by means of plates 912 spaced apart by sepa'- rator 913 and vided by a positioning shaft or pin 924. ich separator G13 has a lug carrying a pin or stud G15 on .which is mounted -a block G13 engaged by the forked end of lever G11 pivoted on the st d G13 supported by the bracket G of an adjy cent folding bed through the bracket G13.

'The stud G13 has attached ,to it the cam lever G23 having a cam roll working in the cam path G21 of the stationary cam frame G22 at the front of the folding cylinder. A

connecting rod G37 connects the lever G17 ywith the Vend 920 of the lever 91T pivoted on the ,stud g1g supported by a bracket g1 4extending 'from the bracket' g of the corrresponding folding bed.l `The lever g17 is connected to theJ separator g15 by stud g15 and block gw..

The movement of the cam roll on each lever G20 in the cam pathway G21 thus simultaneously moves the Wing folders' for one folding bed axially into and out of the positions in which they lie over the portion of the folding bed covered by the blanks` Each ofthe hollow shafts G2 g2 has journaled in it a shaft G45 g4 provided at its inner end .with a gear segment G47 org47 and held against axial displacement by a nut G48 `or 948 at its outer end. Each of the hollow shafts has at its inner vend a gear segment G3 or (75. The guide g51gis supported by a lug g5 of an arm g4 extending from the gear segment g47. The guide G51 is supported by a lug G5 on the arm G4 extending froml the gear segment G5.

AC2 of the cylinder. `lEheXshaft G21 has secured to ita lever g55 .having a gear segment wh-ich actuates the gear segment g47. The

roPat-ion of the shaft G59 thus gives a small re ation to the holding down Wings G5s 953 fora purpose hereinafter specified. A cam lever g4 attached to the shaft'G39 and having a cam lroll Working in the cam path (141 of the cam frame g55 rotates the shaft G55.

The turning back wings G8 and g5 are rotated about the common axis of shaftsG2 and g2 in the following manner: The gear segment g5 meshes with the gear segment carried by the lever (142 attached to a shaft G43 ,'ourn'aled in the web C2. A lever G42 attached to the shaft G43 is provided with a gear segment actuating the gear segment 147. The cam lever G44 attached to the shaft G45 has a cam roll Working in the cam path G45 of the stationary frame G22.

The front tongue or'holding finger G25 is secured to the shaft G24 (see Fig. 9) and hence moves axially into and out of the re' cess C5 as the corresponding 'folding wings move into land out of the position 1n whlch they extend o-ver the folding cylinder. The

tongue or holding finger g25,.however, is axially movable independently of the folding Wings as follows: Its hub, which lsslridingly supported on the shaftg24 has a'lug g2 (see Fig. 1l) connected 'to the rod. g27 supported in the corresponding bracket g.

The outer end of the rod 927 has ahub g2s (lower left hand `corner of' 1 `ig.l 8) from which extends a pin g22 embraced by the fork end of lever ,d50 pivoted on the stud g15 before the latter are it, as shown in Figs. 4:7 and The guide G5 is, .supported by a lug G5 on. an arm G49 se is attached vlce H1. -An eye piece H2 carries a cam roll H7 'the bracket H13.

mouth of the succeeding blank.`

and provided with an extension 951 carrying a cam roll working in the cam path ,(732 of the stationary cam frame 945. Asseen in "Fig, 8, t-he'tongues G25 project by the inner ends of the corresponding-folding wings and thus are able to enter the ends ofthe recesses C5 and assist in holding the blanks Ainplace engaged by the corresponding folding wings. It will be underk stood thatkthe tongue G25 may be operated as 75 is the tongue g25. The operation of the folding wings on the bag blanks will be hereinafter described in detail.

While the upper ply of the Hap end of the blank is being turned back by the turning back wings, as hereinafter described, the upper ply is engaged and supported by an arc shaped member H which 1s held against 48, for the purpose of preventing the overlapped edges X1 85 of the blank, ,then imperfectly fastened together because the paste connecting them is still Wet, from Working back and forth on one another, scissors fashion. The member to a slide H2 by a coupling de- 90 extendlng from the coupling device H1 is connected by rod H4 to the end of a lever H5 which is pivoted at H6 to a bracket- H1 supported fro m the frame Work of the machine. The lever H5 95 which works in the 'cam-Way H2 formed in the continuouslyrotatingcam plate H2. The slide H2 has a slot or guideway formed in it in which is re'- ceived the stationary stud H12 supported ,by The guideway H11 also Slldingly receives a guide H14 journaled on the pivot H15 attached to the disk H5. The

mechanism described is arranged to give the, proper rotative andsliding movement of the member H2 to causethe member H to relative to the fixed pivot H12 properly enter the mouth of each advancing bag and support the ila`p end of the upper ply as it is turned back about the primary transverse cross .fold li-ne, and then move out of the mouth of the blank back and into position to enter the It will be understood that the member H is swung back and forth over the surface of j the folding cylinder C byl the mechanism described and that the ,motion of the member H is so timed that`the" member enters the mouth of the blank as the latter is being opened and engages the rear side of the pockets and bears against it through the final portion of the box forming operation, to gently" support the rear sideof the box and thus prevent zthe plies engaging it from workingon one another which. otherwise occur, inasmuch as. the paste' is still wet.

Thelrechanism for converting the boxlike form into which the forward end of each blank is opened by the wing folders as shown in Fig. 4,8 into' the flattened diamond f bearing support 21` shown in Fig. 50, is mounted on 'the'shaft B17. This mechanism comprises a pair of hubs 11F 18' secured to the shaft B17 and each provided with three' symmetricallydisposed arms 117117. Each arm 117 has journaledin its louter end, one 'en'd of a shaft 116,' the other end ofgwh'ch is journaled 'in the corresponding end -of the arm 17. On each shaft 115 are mounted similar movable heads 113 and 13, against the `flanged' ends 12 2 of which are secured members 11, 1 each of Which` has at -its opposite' (end the curved flattening or foldingvplates 1 On the shaft '11 between-111e moving heads' is clamped a block-like member 17. The round ends of shafts 14 1 are journal'ed in diamet- .rically op osed bosses`1 'formed on the block17. l et'vveen thebosses f1v (Fig. 15).'a crank arm'z's is secured to theV shaft1. A

crank arm11 is secured in a similar manner to the shaft `11'. The arms 12 8 are connected by links 19 9 to iatteningngers .11 1 pivotally secured at 'diametricall opposed poi-nts to the block 17. The sha s 11 1 are shown as square in crdsssection, the bars being twisted, hoWever, soV that thecor-11er edges form'in e'ect threads of low pitch. The square portions-of 4the shaft? 1l1 4 .pass through openings Biting them formed the bosses 13 1 of heads 11,1*t 15, so that a move ment ofeach pair of heads ltoward and away from the inter osed block 17 causes a rota-- 11 1, Whichcauses the lin- 1 to turn relatively' to the block tion of the sha gers 11 and l 17. A guide shaft 112 secured to thenhe'ad 112 slides in lan opening formed to eceive it in the block 17, thus preventing 'anlga'r' movement of the head relative to the block.

vSimilarly the pin shaft 12 prevents angular' movement between the head.12. y* v c The heads 111 13 each 'have 'pivotally secured to them trunniencollars or yokes 111 11 provided wmith trunnions 115 15 on which are journaled links 122 22 ipivoted to ends 124 21 of levers 125 25 by pins 12?21 The levers 125 25 are journaled on pins'12 2 cal'- ried bystuds 127 27 secured to'thearms 11i 17. The leversn125 25 connectedyto the heads on the same shaft 11 are connected by the link 12. Each of thelevers 125 has' secured to it betweenits ends av cam roll 12.5 which Works on the stationary Vcam 129 surrounding the shaft B17 to, cause lthe-'flatteningplates I .to move toward and 'awayjfrom'each other, rlfhe cam 121v is secured .on la'sleeve block and portion of the adjacent'bearingsupport 21' or the shaft B17. Each of) the Iarms 117 has journaled -to it, and vadvantageously by means of the'stud'127,' a spurl gear 12 which meshes with the stationary spur gear- 121, surrounding the shaft B17 andl secured to the Each spur gear 12 meshes with a spur gear 119 lsecured on the end of the adjacent shaft 115.

4The curved liattening blades 1 and have aJ radius of-curvature'substantially equal to the radius of the folding cylinder C and While Working on the bag are moved so that the center of curvature of the operating blades remains in close proximity to the axis of r0- tation of the foldin cylinder, and the aXis ofthe folding cylin er, center of curvature -of the flattenlng plates and primary .transverse fold line allV lie in the same plane. This resuilt is obtained by the combination of the movement of the shafts 11 about the axis ofthe 'shaft B17 with the rotation in the opposite direction of the shafts 116 about nism disclosed, each shaft 11 is 'ven one and one'half back turns ,While-makin Aone complete bodily rotationabout the sha t B17 and the latter 'shaft .revolves twice as fast as the folding cylinder. As the fiattener wings 1 and move from the full line position shown in Fig. 16 into their closest position relative to the folding cylinder and then away through the path indicated b the suecessive dotted line positions of th'e blrades 'shown in Fig. 16, the heads 113 13 are in oved toward and away' from the block 17 from the ,full-line position shown in Fig. 17 through lines back to tlie full line position.

As the blank is moved under` the box 'Hattening lmechanism,` the proper Wings 1 which, remaining substantially parallel to the folding'bed onwhich the blank is held, move toward one another and toward the folding bed as Well as with the latter-thus carrying the sides of the box into which one end of the blank has been opened, toward one another, and eventuallyiiattening them down to form the diamond as shown 1n Fig. 50. After the box has been partially collapsed by the inturning` ofl its sides, the front end of the box is engaged and knocked down by the flattening finger11 or 1 which is turned relatively to the block 17 by the r0- tation of the squared shaft on which ,it is` supported.

The pastingr devices, (see Figs. 1, 4, 5, 6

in two longitudinal lines X2,comprise a pair of` pastin segments J The transverse paste line 2 is applied by the pasting memtheir own axes. With the particular mecha` the successive positions shown in dotted' ber J1. Thepasting devices J and J1 are,

and 51) for applying thepaste to the blank las a scraper to regulate the thickness of the paste thereon and 'to' prevent lumps of pastes or solid foreign matter from being carried by the roll to the pasting devices. The paste box is provided with a lug J8 which abuts against the latch-like member J1", the latter being held in position by'a bolt passing through the slotted opening J 11 in the latch. The pins J 12 projecting from 'the support J13 are received in holes in the paste box J6 to prevent displacement thereofv in the direction yparallel to the axis of the folding cylinder. By releasing thenuts clamping the latch J1 in place, the paste box may be readily removed for cleaning and then be returned to the original position. a

The mechanism for defining' the lines at which the front and back flap portions of the diamond are folded to complete the formation of theY square bag bottoms is carried by the shaft B29 (see Figs. l, 4, 5, 6; 18, 52 and 57). This mechanism includes a pair of spider members K1 securedto the shaft B29 and forming a support for the creasing blades.) A pair of diametrically opposed front 'flap creasing blades K are adjustably secured to the members K1 by bolts K2. A block K10 is secured tothe shaft B29 betweeni the spiders. The member K10 has j ournaled .in it at opposite sides of the shaft\B29 a pair of shafts K9 which are B29.

Each of two pairs of blocks K7,.one pair on each shaft K"v have adj ustably secured to them a back flap creasing blade K6, the body of which, as shown in Fig. 6 is not radial, but has its outer portion inclined away from the corresponding front'flap creasing blade K. The crank arms K15 secured t0 the front ends of the shafts K" have pins K1 eccentrically disposed with reference lto the shaft K9 which are connected by means of springs K17 to pins K5 securedV to arms K4 formed on the front spider member K1. These springs tend to move each blade l toward the adjacent blade K. The back ends of the shafts K1 carry crank arms K11 having cam rolls K12 which tra-vel against the f'inner surface of the stationary cam4 member K13 (see Fig. 18). When each` blade K11 is at the limit of its movement away from the adjacent blade K (position ofkthe blade K6 adjacent the folding cylinder in Fig. 6) the blade is supported as shown in Fig. 6 by the block K10.

. It will jbe understood that the springs K17 hold the cam rolls K12 against the cam flange I 13 and that when either camroll engages with a projection ofthe cam surface toward the shaft B29 lthe corresponding blade K6 ismoved away from the adjacent parallel to .the shaft blade K. The cam K13 is supported on the shaft B29 and is adjustably secured in place by means of the bolt k1* passing through the slotted hole in the bracket K11 lattached to the framework of the machine. The folding cylinder has formed in the surface of each folding bed two axially extending grooves receiving rubber, or the like, creasing pads C22 (see Figs. 8, 16, 44, etc.) two of these creasing pads y.being provided lfor each folding bed, one coperating with the front flap creasing blade and the other with the back flap creasing blade.

Itpwill be understood that the two pairs of blades K and K are duplicates, the pairs Workin alternately on the blanks advanced by the olding cylinder. j

After the flap creasesl are formed, the back flap is first' turned forward down onto the bottom of the blank and then the front flap is turned back onto the back flap.V The bent form of the back flap creasing blades K6 is an advantage in permitting the blades to get quickly out of -the way of the means for turning the back Hap forward.

The means for turning the back flap for- ,w'ard after the flap creases are formed comprises a pair of wiping fingers L Zjfor Aeach folding bed, which sweep over the periphery of the cylinder. Each wiper is connected by a 'portion extending substantiallyl parallel to the end of the cyhnder toa crank arm L1 which is journaled on a substantially radial stud L2 supported on a` b lacket L3 attached to the corresponding bracket G. The stud L2 has attached to it the bevel-gear segment L'1 (see Fig..42) vactuated by the gear segment L5 attached to lever L6. The lever L5 is attached tothe sha-ft L7 ournaled in the web C2 of the cylinder. A cam lever L8 attached f to the shaft L7 carries a stud L9 on which is journaled a ca roll L10 working 1n the cam path L11 of the cam frame G22. Each wiper Z is supported "and cponstructed like the Wiper L and is operated in. a similar manner by a leverl6 secured to the shaft L7.

`Each front blank flap.' is lifted from its foldin .bed `after the front flap crease.. is formeg by fingers m and M carried' by and as shfownY forming integral extensions of arms m1 AM1 attached to shaft M2, `journaled in the arms C1. When in operationeach of l the flap lifter arms M1 or Dm1 and its extension or' finger M or m, respectively, is located below the face of the fplding bed, the finger lM or fm; then being received 1n a corresponding pocketor opening C29 formed for the purpose inthe cylinder C'. Each arm M1 has an extension M3 provided ywith a studding M1 supporting a block M5 received between the forked ends M6 of.l a cam lever M1. The cam levers M7 are attached to shafts M8 journaled in the Webs C2. A cam lever M attached to each shaft MSr has a Stud M10 Asupporting a cam roll M11 working in the cam-path M12 of the cam frameg33.` .The'

bent strapfront Hap-holder N is'supported by a strip N1 attached t to angle brackets N attached tothe sideV frames A. 

